Electric kettle



FIG. 1 is a perspective view of an electric kettle showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings depict portions of the electric kettle that form no part of the claimed design. 

CLAIM The ornamental design for an electric kettle, as shown and described. 